Sleeping bag



- April 15, 1958 R. N. FREEPONS SLEEPING BAG 2 Sheets-Sheet 1 Filed Dec. 27, 1954 INVENTOR. hardNIFree 0118 April 1953 R. N. FREEPONS 2,830,305

SLEEPING BAG Filed Dec. 27, 1954 2 Sheets-Sheet 2 IN V EN TOR.

RicJgardNFree ans ti-vely cold climate. camping oftentimes own two or three sleeping bags of 2,830,305 SLEEPING BAG Richard- N. Freepons, Oswe'go, Oreg., assignor to Ames jI-Iarris Neville Co., Portland, Oreg., a corporation of California Application December 27, 1954, Serial No. 477,618 9 Claims. (Cl. -343) This invention relates to a sleeping bag for use by hikers, campers, fishermen, hunters, and others who must remain overnight in remote areas. More particularly, it relates to a sleeping bag which affords a maximum of sleeping comfort and protection from dampness while affording an adjustable warmth structure which can be in varying sizes and types which are graded in accord with the warmth provided by the filling or insulating material in the inside liners which define the blankets. For example, progressing from the least warm, most inexpensivebag up through the most warm, most expensive bag, these grades may include: (a) a three, four, or five pound wool bag; (b) a two, three, four, or five pound kapok filled bag; (0) a two, three, or four pound duck down or small feather bag; and (d) a two, three, four,

or five pound synthetic fiber bag such as the polyester material sold as Dacron. Each of these bagsprovides a fixed and invariable amount of insulation since, of course,

-the filling or insulating in the liner blankets cannot be changed. Most campers recognize this limitation, however, and attempt to make amends by purchasing a minimum 'bag and using tarpaulins or additional blankets or by sleeping fully clothed in cold weather. Another, more expensive method of obtaining a variable degree of warmth is to use a light bag while camping in a relatively warm climate and a heavy bag while camping in a rela- Those who are well equipped for varying warmth. In any event, I consider this provision of plural bags to be a needless expense and the use of tarpaulin's to be a'needless inconvenience. Accordingly, and in order to solve this problem, I have turned my inventive efforts toward the provision of a novel sleeping bag which is foldable and convertible in order to provide three varying degrees of warmth by providing any of one, two or three layers of blanket liner over or under the sleeping space.

Turning now to the conventional double capacity sleeping bag, this type provides twice the sleeping space of a single bag in order to accommodate a couple. The most popular double sleeping bag heretofore on the market is one which is made up from two single sleeping bags, each of which is equipped with a separating type slide fastener down the side and across the bottom. By opening the fasteners and unfolding two identical bags of this type, the two slide fasteners can be joined as one so that one bag becomes the lower blanket and one becomes the upper blanket. The disadvantages inherent in a utiliza- Patnt i e li atentedApr. =15, res-s tion ofa double bag of this type, of course, include the amount of labor required in assembling a double bag 'moisture through the slide fastener which bounds three of-the four sides of the bag. This slide fastener boundary is less eflicient than an overlapped sewn seam in protecting the sleeping occupants against cold and dampness. If thus is another object of my invention to provide a unitary sleeping bag construction of double sleeping capacity which is more or less permanently fixed and secured marginally by an overlapped stitched seam which traverses one entire side, the entire foot end, and a portion of the second side in order to seal the secured margins against cold, dampness, and drafts.

An even more important object of my invention is to combine, in one unitary construction, the advantageous features of both the above described single capacity bag and the above described double capacity bag.

To the above ends, my novel sleeping bag includes a mated pair of rectangular double bed size liners which are arranged in stacked face-to-face relationship one upon the other to define upper and lower blankets having corresponding first and second side margins, head end margins and foot end margins. The first side margin, a

portion of the second side margin and the entire length of the foot'margin all are joined with a stitched seam in order to seal these secured margins against the entry of cold air, dampness and moisture. Further, the longitudinal center lines of both liner blankets are arranged in coinciding overlying relationship to allow the blankets to be folded together along the center line. This then provides four stacked layers of liner blanket structure bounding a bag of single sleeping capacity. A camper then can sleep with any one of the following blanket arrangements as climatic conditions may dictate: one over layer and three under layers; two over layers and two under layers; three over layers and one under layer. This provision is in service of that object of my invention which relates to the provision of a convertible type sleeping bag.

In addition to the above structure, my sleeping bag is equipped with a separating type slide fastener which is formed in mateable halves arranged with a first half extending along one side margin and one half .ofxth'e foot end margin and with the second half extending along'the opposite side margin and the other half of the foot end margin. 'In cooperation with a pull tab, these'mated fastener halves join the liner blankets when folded about their longitudinal center lines to provide four stacked layers of liner blanket structure which is joined in -a substantially unitary sleeping bag construction. Should the user of this bag move or roll about during his sleep, this unitary construction prevents a bunching up of the various layers or a folding over or afalling away ofthe blanket structure;

In cooperation with the above described slide fastener, I further provide a short slide type fastener which joins the unsewn portion of the side margins previously referred to in order to permit ready access to the sleeping space between the liner blankets or, alternatively, to close that side. These two slide fasteners are parallel one another but are spaced laterally with a protruding flap arranged intermediate their tracks so as'to define a tortuous path and a flap-type seal protecting the unsewnportion of the side margin against the entrance of drafts, rain, and the like. The provision of this structure is an other object of my invention.

A further object of my invention is to provide a four layer sleeping bag of' the above type with mated snap fasteners selectively to secure (a) the lowermost layer to thethird from the bottom; or (b) the lowermost layer to the second from the bottom, and the third from the 3. from the bottom. Respectively, these define a sleeping space with (a) three layers under and one over; or (b) two layers under and two over; or (c) one layer under and three over. In each case, it will be noted, the layers both over and under the sleeping space are secured together to define a unitary structure which will not bunch, slide down, or come apart while in use.

Yet another object of my invention is to provide a double capacity sleeping bag and a single width head flap with mated snap fasteners detachably and selectively to secure the head flap to either half of the double capacity bag or along the middle section thereof. This provision for shifting the head flap again is correlated to the provision of one, two or three layers of blanket covering and to the conversion of the bag from single to double capacity. In each case, the head flap is of maximum utility and is correlated to the corresponding arrangement of the blanket layers in order that but one head flap need be provided and carried with each sleeping bag.

Yet another object of my invention is to provide a convertible sleeping bag of the above type which utilizes a minimum length of slide fastener and a minimum number of snap fasteners consistent with the provision of adequate entry to the sleeping space and consistent with an adequate provision for attaching a protective head flap and inserting one or more air mattresses.

A correlated inventive object is the provision of a sleeping bag with the above features which can be fabricated at a minimum cost in order to make practical the merchandising thereof in the highly competitive sleeping bag market. r

The above and other objects and advantages of my invention will become apparent from a consideration of the following detailed description, taken in conjunction with the accompanying drawings, wherein:

Figs. 1 and 2 are related perspective views of my sleeping bag with the liner blankets arranged in the respective positions of one layer over and three layers under and with two layers over and two layers under;

Fig. 3 is a section view taken substantially on the line 3-3 of Fig. 2 and somewhat enlarged and exaggerated in order to illustrate the spaced relationship of the slide fasteners and the corresponding positions of the water resistant covers, the four blanket layers, and an air mattress;

Fig. 4 is a perspective view of my sleeping bag arranged for double capacity with the head flap secured in place across the middle of the head end;

Fig. 5 is a head end view of the double capacity bag 50 of Fig. 4 showing, in full lines, the position of the head flap for double occupancy and, in dashed outline,

one of the two positions to which the head flap may be moved or shifted when the bag is converted to provide" one, two, or three layers of blanket over or under the sleeping space;

Fig. 6 is a cross section detail, taken substantially on the line 6'-6 of Fig. 1, somewhat enlarged and exaggerated to illustrate the arrangement of the three underlying blanket layers with an air mattress in place and to indieate the manner in which the third layer from the bottom is secured with a snap fastener to the bottom layer in order to trap and hold the middle layer therebetween; and

Fig. 7 is another cross section detail, taken substantially on the line 77 of Fig. 2, showing the manner in which the blankets of a two layer construction are joined by means of snap fasteners to prevent bunching or slipping of one liner blanket relative to the other.

Referring initially to Fig. 4 of the drawings, the sleeping bag is folded open in order to reveal two main structural elements which are a mated pair of rectangular double bed size liners 8 and 9. These liners are arranged in stacked face-to-face relationship one above the other during use in order that the liner 8 will define a lower blanket and the liner 9 will define an upper blanket. In

construction, each liner blanket is filled with a fiufiy insulating material in the form of a batt in order to provide additional warmth in sleeping. Additionally, the inner faces of both liners are lined with flannel or a comparable material soft to the touch and adapted for sleeping bag use.

It is, of course, necessary that any sleeping bag afford all possible sleeping comfort and protection from the cold and dampness. Tothis end, I provide an underlying water resistent double bed size outer cover 10 which abuts the lower blanket 8. This outer cover, 10 is secured along the entire length of both side margins and the foot end margin to the lower blanket 8 by a stitched seam which defines a more or less permanent type of joinder. As best shown in the cross sections of Figs. 6 and 7, however, the outer cover 10 is spaced from the head end margin of the lower blanket 8 to allow the insertion of an air mattress which I designate by the reference letter M. To complete the water resistant covering for the sleeping bag, a top covering 11 of water resistant material is made integral with the upper liner blanket 9. Thus, referring to Fig. 4, when my sleeping bag is used in double capacity, the outer cover 10 underliesthe bag and the similar water resistant covering 11 overliesthe bag to provide a complete all around protection against the elements.

As previously noted, my sleeping bag is convertible to provide any of one, two, or three layers of blanket over or under the sleeping space which is designated by the reference letter S. In Figs. 1 and 6, but one layer overlies the sleeping space S whereas .three layers underlie the same. Similarly, Figs. 2 and 7 illustrate an arrangement wherein two layers are over and two under. The arrangement wherein three layers are over and one is under is similar to that of Figs. 1 and 6 except that theentire sleeping bag is turned over on its opposite face. Entry to the sleeping space S then is had from the left instead of from the right side.

In order to allow for the conversion above described, I provide a major separating type slide fastener which is formed in separable yet matable halves 12 and 13. The half 12 extends along one side margin and one half of the foot end margin and the half 13extends along the opposite side and the other half of the foot end margin. A pull tab 14 is provided detachably to join these halves 12 and 13 when the liner blankets 8 and 9 are folded about the longitudinal center lines thereof to provide four stacked layers of liner blanket structure, as is shown in Figs. 1 to 3, 6 and 7. In the double capacity arrangement of Fig. 4, on the other hand, the halves 12 and 13 are separated to allow the blankets to fold out fiat.

In order to permit access to the sleeping spaces between the various layers, a short slide type fastener 15 also is provided. Referring in particular to Fig. 4, it will be seen that this shorter fastener 15 extends only along a portion of one side margin of the two liners. It thus serves detachably to join the unsecured o1 unsewn portion of the side margin in order either to permit ready access to the sleepingspace or to close that side once access has been had;

At this point, reference should be had to Fig. 3 of the drawings wherein the slide fasteners 15 and 12, 13 are shown secured to theouter cover 19. There it will be noted that these fasteners, while they are parallel one to another, are spaced laterally when closed. This lateral spacing defines a more or less tortuous path of entry past both slide fasteners and is in cooperation with a sealing type of protruding flap 16. The protruding flap 16 is pendent from one side margin of the outer cover 11 and is arranged parallel to and intermediate the short and the major slide fastener sealiugly to underlie one of the slide fasteners when both are secured as shown in Fig. 3. related larger flap of the liner material 3.7, the edge or margin of the sleeping bag is sealed against, the entry By this arrangement, and in cooperation with a .ateLthe lower liner 8 and the outer 9 drafts um i t rwh i a 1 9: l yer starts? 112v?! arrangement of the liners'is efle ctcd.

To complete the structuralelemnts of my sleeping bag, three sets of mated snap-fa teners are "arranged: The firstof these sets is designated by the refei'encelnnmeral 1 8andis shown in the cross sections of Fi gs'x'G and f. This set of mated snap fastener's ls detachabl'y and sele c tively secures the lower blanket head end margimto'the corresponding margin of the enter cover angl tHree-separate pairs traversethe length of the-head end. Thefi'rst of these pairs is on the center line of :the blankets and one of each of the otherpairs isarrangcd*-intcrmediate or'midway of eachha-lf of the blankets. Sincethe-enter 'margins of the cover 10 are sewnto'the'linenblankets, nosnap fastener need be provided-at the extreme outer margins. When opened brunsnapgiedpt-hese fasteners allow-one. or more air mattresses to -be inserted intermedicover- *10, --all as hereinafter will be described. 7

.Thesecond set ofmated snap fasteners isrdesi-gnated by the. reference numerals 19 in Eigs.-6- and= 7. Illi'EigJ6,

.the. fasteners 19 detachably secure 'the. lowermost! layenof the liner 9. to the layerwhich is third fromw the b'o ttomiin order to defineasleeping space .S haVing-jhi'edayers underand one over. In Fig. 7,.the:fastene rsc19 detachably. secure the. abutting head .end "faces of the liners $8 and 9. That istosay, thelowermost layer issecuredto thesecond layer and in similarfashion butnottshown in the drawings, the third layer is joined to t-heztopmost layer. This latter provision isatwo over:two arrangc- .ment. Lastly, to define a three overonezarrangement,

the entire sleeping bagis turnedover andthasnapzffls- .teners arranged as shown in Fig. ,-6 exceptzt-hatgthrec layers then are on top andthe. ainmattress Mtnntilerlies -In either the one.oyerthrceton-three thelsingle layer. w

it will ;-be notedthat ;the middle Y6]: one arrangement,

layer ,8 is trapped between and .is ;held by, two layers ;located at the opposite sidesthereof and secured; at, h;

head ends by the snaps 19. Thistprevents inadve movement or disarrangement of theblanlgets should th e sleep ove about or. ro ove dur nsh sslsm- Tie third s o p fas ener i s s na d b th reference numerals 20- and, this setis bestshown In t n, h ap 0 c c o s c r a. hashave; in an. pp op i p s na g th g s fin m s c the outer cover 10. As will be evident, the head tflap-ll carries a draw string at on end thereof and-appropriate forked stakes or other means are providedby the camper n order to efine a e er Or 1 11.? as l ls i f the sleeping bag. It further is convcntional in ma w sleeping bags to use the head flap as a coyeringfor the tbagwhen the bag is rolled up or packedaway,

In any event, the, head flap 21 of the insta nt,inyention is ,of a single width as shown in Figs. 1, 4 an 5. Mated pairsof the fasteners 20 are arranged at. A spaced points, as is shown in Fig 5. The-halve ofcach snap which are carried by the flap 21 itself, are arranged at three points therealong. In thismannen the flap either can be secured centrally of a. double capacity bag, as shown in Figs; 4 and 5, or to one or the other sid eswhen the bag is used in single capacity. The'dashed 'ontlinein Fig. illustrates the appropriate arrangementiof thethead flap 21 with the three snaps 20 to the left asit wo uld be used when the blanket layers defil i a. three. oyerv one arrangement. These provisions give a maXimumIprotectionagainst the elements yet allow theuse of a single head fla 5n use, the double capacity arrangement of my convertible sleeping bag is shown in Fig. 4. It the'rei n will be noted that approximately one-half of theneanrnarjginal edge, the entire'foot end, and the entire distant marginal edge of the two liners Sand 9.are secured by a sewn seam. Thus, the occupants of the, sleeping bag do not have their feet against a cold slide-type fastener and the interior of the bag is much warmer than with a conven- 10 tudinalcenter-line andthe matedhalVes-IZ andl-S of the onslide about 'during use.

slide-type fastener have been joined by the pull tab l'4- so as to define a .unitarystructure. In addition,-the head ends of the' liners 8 and 9 have been joinedby the detachable snap'fasteners 19-so the blankets will not'bunch up In this arrangement of 1 the bag-access is providedto the sleeping space bypulling the-tab to -separate: the mated halves 12, 13 from the:top and-folding back a portionof the overlying two layersas shown in Fig. 2. In addition, the head flap zlihasbeen 20 secure'd to the-head end of the outer cover-10sby employing those three snap-fasteners 20 .which are illustrated- :at

-the right-in Fig. 5.

. Whemthe bag is foldedfor singlecapacity with either -one o'ver and threeunder as'viewed in Fig. l, or with '25 'three over and. one under, the slide fastener 15. as well .as

.the tab :14. and slide. fastener 12, 13 are opened simultaneously to:provide.access tothe sleeping space'below the upper'most layer. :-In the. oppositearrangement, withthree layersa over and one under, the' bag .is turned completely -over:and theheadzpiece 21 is snapped .to the opposite ..set.,-of :three snap fasteners .20. ,Access .to the sleeping -space Sgthen; is hadzfrorn theleft side of thebag' butthe fil decallowing: such access .stillis 15.

. -In 1t,he preferred'construction of .my .sleeping bag, the rs; 8 and 9i. -are;,flannel -lined and filled with a selected eightpf synthetic fiber, wool, kapok, down, or the like, flufiedupin the form of a batt. Assuming, for example, that thisIWeight is three pounds, the camper using the s leepi ng, bag for double capacity will have sufficient warmth for almost; all desired. conditions since .two people naturally require less artificial warmth and insulating qogeragerthan one person. Usually,double bags are used -Ib y husband;andwife while camping, such as in the sum- .mertime. Women usually do not go on hunting trips .during inclement weather and then the sleeping bag can bedoubled and used by the husband. Thatis, the one, two, or three layer over or under construction allows the =iing1e;capacity:use of the same bag with a corresponding multiple insulating value. In a hike which may include scalinga mountain, the one layer over and three layer oo ablcs than heretofore has been available in any sleeping bag; with, which ,I am familiar.

In; summary, it will be seen that I have provided a unitary. sleeping, bag construction which will require a couple. .to purchase butone bag which is adaptable to =provide warmth ,andi comfort under a variety of climatic conditions. This bag is foldable for use as either at single 'or'a double capacity bag and, while folded for single capacity, is convertible to provide any of one, two or three layers of blanket over or under the sleeping space.

In addition, the minimum slide fastener and snap fastener construction is correlated to this convertible structure so as to keep the cost ofthe sleeping bag to a minimum thereby making the bag competitive with other single and double capacity sleeping bags.

1. In a unitary sleeping bag constructionconvertible to provide any of one, two or three layers of blanket over or under the sleeping space, double liner means stacked face to face and defining an upper and a lower blanket with coinciding margins, said blankets having overlying coinciding longitudinal center lines and being foldable over each other about these center lines to provide four stacked layers of blanket structure bounding a bag of single sleeping capacity, and mated fastener means operative when said blankets are folded to provide four stacked layers detachably and selectively to secure the lowermost layer to the third from the bottom, or the lowermostlayer to the second from the bottom and the third from the bottom to the topmost, or the topmost to the second from the bottom, respectively, to define a sleeping space with three layers under and one over, or two layers under and two over, or one layer under and three over. 1

2. A sleeping bag, comprising double liner means arranged one upon the other to define coinciding first and second side margins, head end margins and foot end margins, said liners being permanently fixed and secured marginally one to another with a joinder means which extends along the entire length of said first side, the entire foot end and a portion of the second side .to seal those secured margins against drafts andmoisture, a short slide type fastener means detachably for joining the unsecured portion of said second side marginsselectively to permit ready access to the sleeping space between the liners or to close that side, and a major separting type slide fastener means formed in matable halves arranged with a first half extending along said first: side margins and one half of said foot end margins and with a second half extending along said second side margins and the other half of said foot end margins, said short and major slide fasteners being parallel one another but being spaced laterally when closed to define a tortuous path helping seal the unsecured portion of said second side margins against drafts and moisture.

3. In a unitary sleeping bag construction foldable for use as either a single or a double capacity bag and, while folded for single capacity, convertible to provide any of one, two or three layers of blanket over or under the sleeping space, a mated pair of double bed size liners arranged one upon the other to define upper and lower blankets having corresponding first and second side marthree layers under and one over, or two layers under and two over, or one layer under and three over.

5. Ina unitary sleeping bag construction foldable for use aseither a single or a double capacity bag and, while folded for single capacity, convertible to provide any of one, two or three layers of blanket over or under the sleeping space, a mated pair of double bed size liners arrangedinstacked face-to-face relationship one upon the other to define upper and lower blankets having coinciding first and second side margins, head end margins and foot end margins, fastener means formed in matable halves arranged with a first half extending along said first side margins and one half of said foot end margins and with a second half extending along said second side margins and the other half of said foot end margins, said fastener means including means detachably for joining said first and second halves when said liner blankets are folded about the longitudinal center lines thereof to provide four stacked layers of liner blanket structure bounding a bag of single sleeping capacity, a water resistant double bed size outer cover abutting said lower blanket and secured along both of said side margins and said foot end margins, to said lower blanket, and mated fastenermeans spaced along the exposed head end margin of said outer coverd'etachably and selectively to secure a head flap to either half or along the middle section of the cover.

' 6. A sleeping bag, comprising a matedpair of double bed size liners defining upper and lower blankets having coinciding head end margins and foldable to provide either two or four layers, a water resistant double bed size outer cover secured for said lower blanket, a first set of mated fastener means, detachable and selective, tosecure said lower blanket head end margin to the corresponding margin of said outer cover at spaced points, a second set of mated fastener means operative when said liners are folded to providelfour stacked layers, de-

tachable and selective, to define a sleeping space with three layers under and one over, or two layers under and two over, or one layer under and three over, and a third set of mated fastener means spaced along the exposed head end margin of said outer cover, detachable and selective, to secure a head flap to either half or along the middle section of the cover, said latter fastener means including atleast five equi-spaced snap halves carried by saidcover along the full double bed width thereof and atleast three similarly equi-spaced snap halves carried gins, head end margins and foot end margins, said liners being secured marginally one to another with a joinder means along the entire length of said first side margins, the entire foot end margins and a portion of the second side margins to seal those secured margins against drafts and moisture, and a water resistant double bed size outer cover separate from but abutting said lower blanket and secured along both of said side margins and said f oot end margins to the lower blanket, said outer cover being separable from the head end margin to said lower blanket to allow the insertion of either a single or 'a double width air mattress between the blanket and cover.

4. In a unitary sleeping bag construction, a pair'of double bed size liner blankets having coinciding firstand second sidernargins, head end margins; andfoot endmargins, said liner blankets having overlying coinciding-longitudinal center lines and being foldable about these center lines to provide four stacked layers of linerblanket by a head flap which is of but single bed width.

7. A unitary sleeping bag construction foldable for use as either a single or a double capacity bag, comprising a mated pair of double bed size liners arranged in stackedface-to-face relationship one upon the other to define upper and lower blankets having corresponding first and second side margins, head end margins and foot end margins, said liners being secured marginally one to another with a joinder means along the entire length of said first side margins, the entire foot end margins and a portion of the second side margins, a short slide type fastener ,means detachably for joining the unsecured portion of said second side margins selectively to permit .ready access to the sleeping space between the liners or to close that side, a major separating type slide fastener means formed in matable halves arranged with a first half extending along said first side margins and one half of said foot end margins and with a second half extending long said second side margins and the other half of said foot end margins, said major fastener means including means detachably for joining said first and second halves "when said liner blankets are folded about the longitudinal center lines thereof to provide four stacked layers of liner blanket structure, a water resistant double bed size outer cover abutting said lower blanket and secured along both of said side margins and said foot end margins to the lower blanket, and mated snap fastener means spaced along the exposed head end margin to said outer cover detachably and selectively to secure a head flap to either half or along the middle section of the cover.

8. In a unitary sleeping bag construction, a mated pair of double bed size liners arranged one upon the other to define upper and lower blankets having corresponding first and second side margins, head end margins and foot end margins, said liner blankets having overlying coinciding longitudinal center lines and being foldable about these center lines to provide four stacked layers of liner blanket structure bounding a bag of single sleeping capacity, fastener means detachably for joining the unsecured portion of said second side margins selectively to permit ready access to the sleeping space between the liners or to close that side, a major separating type slide fastener means formed in matable halves arranged with a first half extending along said first side margins and one half of said foot end margins and with a second half extending along said second side margins and the other half of said foot end margins, a water resistant double bed size outer cover abutting said lower blanket and secured along both of said side margins and said foot end margins to said lower blanket, said short and major slide fasteners being parallel to one another but being spaced laterally when closed to define a tortuous path helping seal the unsecured portion of said second side margins against drafts and moisture, and a protruding flap means pendent from one side margin of said outer cover and arranged parallel to and intermediate said short and major slide fasteners sealingly to underlie one of the slide fasteners when both fasteners are secured.

9. A unitary sleeping bag construction foldable for use as either a single or a double capacity bag, comprising a mated pair of rectangular double bed size liners arranged in stacked face to face relationship one upon the other to define upper and lower blankets having corresponding first and second side margins, head end margins and foot end margins, said liner blankets being filled with a fluify insulating material in the form of a batt to provide additional warmth in sleeping and having water resistant means covering the exposed faces thereof, said liners being permanently fixed and secured marginally one to another with a stitched seam joinder means along the entire length of said first side margins, the entire foot end margins and a portion of the second side margins to seal those secured margins against drafts and moisture, a short slide type fastener mean detachably for joining the unsecured portion of said second side margins selectively to permit ready access to the sleeping space between the liners or to close that side, a major separating type slide fastener means formed in matable halves arranged with a first half extending along said first side margins and one half of said foot end margins and with a second half extending along said second side margins and the other half of said foot end margins, said major fastener means including a pull tab detachably for joining said first and second halves when said liner blankets are folded about the longitudinal center lines thereof to provide four stacked layers of liner blanket structure bounding a bag of single sleeping capacity, a water resistant double bed size outer covering abutting said lower blanket and secured along both of said side margins and said foot end margins to said lower blanket by a stitched seam, said outer cover being spaced from the head end margin of said lower blanket to allow the insertion of either a single or a double width air mattress between the blanket and cover, said short and major slide fasteners being parallel one another but being spaced laterally when closed to define a tortuous path helping seal the unsecured portion of said second side margins against drafts and moisture, a first set of mated snap fastener means detachably and selectively to secure said lower blanket head end margin to the corresponding margin of said outer cover at spaced points, a second set of mated snap fastener means operative when said liners are folded to provide four stacked layers detachably and selectively to secure the lowermost layer to the third from the bottom, or the lowermost layer to the second from the bottom and the third from the bottom to the topmost, or the topmost to the second from the bottom, respectively, to define a sleeping space with three layers under and one over, or two layers under and two over, or one layer under and three over, and a third set of mated snap fastener means spaced along the exposed head end margin of said outer cover detachably and selectively to secure a head flap to either half or along the middle section of the cover, said latter fastener means including at least five equi-spaced snap halves carried by said cover along the full double bed width thereof and at least three similarly equi-spaced snap halves carried by a head flap which is of but single bed width.

References Cited in the file of this patent UNITED STATES PATENTS 1,323,610 Price Dec. 2, 1919 2,064,458 Bulpit Dec. 15, 1936 2,242,130 Hutchison May 13, 1941 2,379,416 Clark July 3, 1945 2,594,438 Howe Apr. 29, 1952 FOREIGN PATENTS 476,162 Great Britain --r--v--.---s- Dec. 3, 1937 

